420 BC - Hippocrates begins the scientific study of medicine by maintaining that diseases have natural causes and puts forth the Hippocratic Oath, marking the birth of modern medicine
... (+ 1986)
January 22 - George Balanchine, choreographer (+ 1983)
January 26 - Ancel Keys, scientist
February 1 - S. J. Perelman[?], humorist, author
February 4 - ...